Remove useless copy on zip file load (#36362)
Summary:
Instead of copying to a buffer, then setting a tensor's storage with that buffer, create a storage directly from the file
](https://our.intern.facebook.com/intern/diff/21057090/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/36362
Pulled By: driazati
Differential Revision: D21057090
fbshipit-source-id: e3d30a3b09f4d67bf4bb7a0dd7f4f60c3dd1a47e
